So, using the same method as the Resplendent Chest Farming.
Take the quest: The Black Soulstone from the very beginning.
Take the waypoint to "Desolate Sands".
Run to the very bottom of the map until you receive a checkpoint.
Once you get the checkpoint, leave the game.
Click Resume Game.
now, go down, and you'll hit a twisting path. There is a decent chance to get rare monsters/treasure goblin/seekers there. Follow the path until you get to the next waypoint, as treasure goblins/seekers can be down there as well.
(Looks like they nerfed the chest farming already)
You have a decent chance of getting some Rare monsters, and/or Treasure goblin/seekers.
Using this, I was able to loot about 5 gold items in a few minutes on nightmare, with no MF, and a ton of gold.
(Run down the path, if rares/ treasure goblin/seekers aren't there, reset it)